Water-tube boiler.



No. 630,259. Patented Aug. I, I899.

v W. W. McKELVEY.

WATER TUBE BOILER.

(Applicaiion filed Mar. 2, 1899.) (lo Model.) 2 Sheets-Sheet l.

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w. w. McKELVEY.

WATER TUBEBOILER.

(Application filed mu. 2, 1899.)

(No Model.) 2 Sheets-Sheet 2.

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UNIT D STATES PATENT O FICE.

TVILLIAM \V. MCKELVEY, OF YOUNGSTOWN, OHIO, ASSIGNOR TO THE TVILLIAM B. POLLOOK COMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 630,259, dated August 1, 1899. Application filed March 2, 1899. Serial No. 707,655. (No model.)

To all whom, it may concern.-

Beit known that I, WILLIAM W. MCKEL- vEY, of Youngstown, in'the county of Mahoning and State of Ohio, have invented a new and useful Improvement in WVater-Tube Boilers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a sectional side elevation of my improved boiler, and Fig. 2 is a horizontal section on the line 11 11 of Fig. 1.

My invention relates to vertical water-tube boilers,and more especially to that type wherein a vertical upper steam and water drum is employed, with tubes extending downwardly from its lower head; and its object is to improve the efficiency of this type of boilers and extract the heat from the circulating gases to a greater extent than was heretofore possible, and, further, to provide a stronger and longerlived structure and one which may be easily' cleaned and repaired.

In the drawings,2 represents an upper steam and water drum of cylindrical shape, having a dome-shaped upper head 3, provided with a manhole 4 and surrounding hand-holes 5. The lower head 6 of-this drum is bent so as to produce a central transverse ridge, the opposite segmental portions of the head extending from the center outwardly at a slight angle to the horizontal. Into the half portions of the head 6 thus formed extend two sets or banks of tubes 7 and 8, which are inclined in opposite directions an d enter the upper heads of vertical cylindrical mud=drums 9 and 10, respectively. The upper-heads of these muddrums are inclined to accord with the inclination of the tubes and the lower head of the steam and water drum, the entire m ud-dru m in each case being supported in a slightlyinclined position upon the supporting-brackets 11, though, if desired, these drums maybe set vertically and their upper heads inclined inwardly toward the center. The brackets 11 are supported upon I-beams 12, which extend on both sides of the in ud-drums and are carried in the masonry foundation inclosing the pits 13 for the mud-dru1ns.

The mud-drums are connected by a large /water-leg 14, and the dome-shaped head 15 of one of these drums is provided with a manhole 16, through which both drums may be entered for cleaning and repairs.

The entire weight of the boiler is supported upon the beams 12, and the mud-drums are;

spaced apart from their inclosing walls to allow for expansion and make the boiler independent of its inclosing walls. A vertical partition-wall 17 extends upwardly between the banks of tubes 7 and 8, and the furnace or combustion-chamber 18 is located at one side of one of the banks of tubes and provided with a bridge-wall 19, which protects the muddrum from thehot gases and products of combustion.

The inclosing shell or wall 20 of the boiler surrounds the structure and incloses the lower portion of the steam and water drum, and the draft-flue 21 leads from the lower part of the shell at a point opposite to the location of the furnace, thus compelling the hot gases to pass upwardly among one set of tubes, thence across the lower head of the steam and Water drum, and then downwardly among the other set of tubes.

I have shown the draft-flue as leading to an underground flue 22; but it will be understood that it may be connected with overhead fines or that a chimney may be built at the rear of the boiler, into which this fine may open directly.

The pits 13 are provided with doors 23, through which accumulated dust may be removed, and the outer shell of the boiler is provided with doors 24, which may be opened to permit blowing the dust and soot from the tubes and tube-sheets. The steam and water drum is provided with the usual water column 25 and with the connection 20 for the steam-main.

When the boiler is in operation, the tubes 8 being subjected to a higher heat than the tubes 7 a strong circulation will take place, passing upwardly through the tubes 8, down through the tubes 7, and forward through the waterleg 14:.

The advantages of my invention will be apparent to those skilled in the art, since a double pass is given to the gases, while at the same time the boiler is easily and cheaply constructed by reason of the tubes entering the heads of the vertically-extending cylindrical I By oppositely inclining the sets of ing the setting.

. Many changes may be made in the form and arrangement ofthe drums, the tubes, and the setting without departing from my invention, since I claim- V 1. A vertical water-tube boiler having a single vertically-extending steam and water drum with upper and lower heads, tubes extendingfrom the lower headto the upper heads of aplurality of lower mud-drums, a partition between the tubes leading to one drum and those leading to the other, a source of heat opening into the lower portion of one set of tubes, and an outlet-flue at the lower portion of the other set of tubes, whereby the gases pass upwardly through the first set and thence over the top of the partition-wall and downwardly through the second set; substantially as described.

2. A vertical water-tube boiler, having a single upper vcrtically-exten ding drum, with a lower head having oppositely-inclined portions two vertically extending mud-drums, two oppositely-inclined banks of tubes connecting the upper heads of the mud-drums with the lower head of the upper drum, a partition-wallbetween the sets of tubes, a source of heat at the lower portion of one set of tubes, and an outlet-flue at the lower portion of the other set; substantially as described.

3. In a vertical water-tube boiler, a vertical cylindrical upper drum having a lower head with oppositely-inclined portions, lower vmud -drums with correspondinglyinclined upper heads, outwardly-inclined sets of tubes connecting the portions of the lower head of the upper drum with the heads of the muddrums, a partition-wall between the sets of tubes extending upwardly to a point below the upper drum, a source of heat leading into one bank of tubes, and an outlet-flue near the lower end of the other bank; substantially as described.

In testimony whereof I have hereunto set my hand.

\V. W. MOKELVEY. Witnesses:

' O. W. MOOLURE, G. B. BLEMMING. 

